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The Democratic Unionist Party has backed Theresa May's phase one Brexit deal, having secured six "substantial" changes to the text addressing the Irish border issue.

Arlene Foster, the party's leader, told Sky News this morning that following talks with the prime minister "there is no red line down the Irish Sea and clear confirmation that the entirety of the UK is leaving the European Union, the single market and the customs unions."

However, DUP sources warned early on Friday morning that they still had concerns about the arrangement.

Meanwhile Leo Varadkar, the Irish prime minister, hailed the deal as a roaring victory for EU diplomacy which had secured a "bullet-proof" and "cast iron"...